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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2025,3,25]]},"abstract":"<jats:p>\n                    The global sulfur cycle plays a critical role in the redox evolution of Earth\u2019s surface and upper mantle, yet the distribution and origin of sulfur in the mantle remains largely unconstrained. El Hierro is a volcanic island in the Canary archipelago that is fed by sulfur-rich magmas. To constrain the origin of sulfur in these melts, we combine in situ sulfur isotope analyses with regression modeling. We calculate that undegassed El Hierro melts have\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>34<\/jats:sup>\n                    S values of 0 \u00b1 2\u2030. The average\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>34<\/jats:sup>\n                    S of undegassed El Hierro melts is 0.3\u2030 to 1\u2030 higher than magmas erupting at mid-ocean ridges. Mass balance calculations reveal that El Hierro\u2019s mantle source contains 310 \u00b1 120 \u03bcg\/g sulfur and that on average 60% of sulfur in the source is of recycled origin. This recycled material should contain &gt;1,800 \u03bcg\/g sulfur to satisfy isotopic constraints on its mass fraction in the mantle source. The sulfur and oxygen isotopic signature in serpentinites and sediments deviate significantly from the upper mantle, making them unsuitable candidates for the recycled material. An oxidized partial melt of recycled oceanic crust that retained one third of its sulfur budget after subduction zone processing can explain excess sulfur in the Canary Island mantle. Recycled oceanic crust is expected to contain sulfur as sulfide, which is not capable of oxidizing the mantle. The presence of ferric iron in the recycled component is necessary to produce metasomatic melts that are oxidizing enough to carry sufficient sulfur into the mantle source of ocean island basalts.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2416070122","type":"journal-article","created":{"date-parts":[[2025,3,19]],"date-time":"2025-03-19T12:52:26Z","timestamp":1742388746000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":8,"title":["The origin of sulfur in Canary Island magmas and its implications for Earth\u2019s deep sulfur cycle"],"prefix":"10.1073","volume":"122","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6183-0049","authenticated-orcid":false,"given":"Zolt\u00e1n","family":"Taracs\u00e1k","sequence":"first","affiliation":[{"name":"Department of Earth Sciences","place":["Cambridge, United Kingdom"]},{"name":"University of Cambridge","place":["Cambridge, United Kingdom"]},{"name":"Department of Earth and Environmental Sciences","place":["Manchester, United Kingdom"]},{"name":"The University of Manchester","place":["Manchester, United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2698-8622","authenticated-orcid":false,"given":"Margaret E.","family":"Hartley","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences","place":["Manchester, United Kingdom"]},{"name":"The University of Manchester","place":["Manchester, United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7674-8718","authenticated-orcid":false,"given":"Ray","family":"Burgess","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences","place":["Manchester, United Kingdom"]},{"name":"The University of Manchester","place":["Manchester, United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1243-137X","authenticated-orcid":false,"given":"Marie","family":"Edmonds","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences","place":["Cambridge, United Kingdom"]},{"name":"University of Cambridge","place":["Cambridge, United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc-Antoine","family":"Longpr\u00e9","sequence":"additional","affiliation":[{"name":"School of Earth and Environmental Sciences","place":["Flushing"]},{"name":"Queens College","place":["Flushing"]},{"name":"City University of New York","place":["Flushing"]},{"name":"The Graduate Center","place":["New York"]},{"name":"City University of New York","place":["New York"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian D.","family":"Monteleone","sequence":"additional","affiliation":[{"name":"Department of Geology and Geophysics","place":["Woods Hole"]},{"name":"Woods Hole Oceanographic Institution","place":["Woods Hole"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3490-9875","authenticated-orcid":false,"given":"Romain","family":"Tart\u00e8se","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences","place":["Manchester, United Kingdom"]},{"name":"The University of Manchester","place":["Manchester, United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9298-2173","authenticated-orcid":false,"given":"Alexandra V.","family":"Turchyn","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences","place":["Cambridge, United Kingdom"]},{"name":"University of Cambridge","place":["Cambridge, United 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